SUMMARY After plasmashell has started, it is consuming CPU time doing apparently nothing. According to strace, it is woken up due to a ~16ms ppoll timeout. This is likely some animation which has not been stopped correctly. The polling stops as soon as the "Status and Notification" popup is opened the first time, afterwards the process is completely idle. STEPS TO REPRODUCE 1. Start plasmashell (as part of the session, or with --restart, does not matter) 2. Attach strace to the main thread 3. Open the popup using the ^ up arrow OBSERVED RESULT Plasmashell consumes CPU time doing nothing, and behaves correctly after opening the popup once. EXPECTED RESULT Plasmashell becomes idle immediately after start, without user intervention. SOFTWARE/OS VERSIONS Linux/KDE Plasma: (available in About System) KDE Plasma Version: 5.27.9 KDE Frameworks Version: 5.112 Qt Version: 5.15.11 ADDITIONAL INFORMATION
Are you able to reproduce this by simply restarting plasmashell? Or does it only happen when plasmashell stars following a login event? Can you provide a screenshot of that your System Tray looks like so I can see what's in it?
I have seen this also after "plasmashell --replace", so probably unrelated to session start (though, there may be some timing related stuff which has an influence). One influenced system was a fresh installation, i.e. very basic.
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